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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '344b4d05cdd02c78ad99d76793b751cd47259e26bcd639a9297899e4df3c2ce9' 
  AND token = 'D5fXtZIcWq8cVy6wB+DFeNQiXoQA/9r32hrPvG3wRJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}